Pen



FIG. 1 is a bottom left front perspective view of a pen showing my new design;

FIG. 2 is a top right front perspective view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is an enlarged fragmentary view, showing the transparent portion of the pen in greater detail. 

The ornamental design for a pen, as shown and described. 